Operating knob for portable electronic computer



FIG. 1 is front, right and bottom perspective view of an operating knob for portable electronic computer showing our new design;

FIG. 2 is rear, left and top perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a right side view thereof; and,

FIG. 9 is a reference perspective view showing the operating knob attached to a portable electronic computer.

The subject matter in FIG. 9 shown in broken-line format is for environmental purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for an operating knob for portable electronic computer, as shown and described. 